I just am not a fan of revolvers. Mostly because they don't have a safety. Of course many new semi auto's like the LCP don't either which I don't like. I love semi autos and hardly ever have one jam. If you learn what you are doing it's not easy to have one loaded and you not know it.

The single Action and double action mostly refers to revolvers. Double action is basically like a semi auto revolver and the single action you have to manually pull the hammer back every time.